Let users sort posts in Wordpress

Try Simple Custom Post Order plugin.

It is using AJAX and JavaScript, you don’t have to load anything else. You have to just drag and drop the posts.

Using $_GET parameters is the way to go here. First of all you'll want to allow your visitors access to these add these variables. The link approach is fine, overall, so we can generate augmented links by using the add_query_arg to tack on extra parameters to the current URL.

<?php    $urla = add_query_arg( 'sort' => 'price', 'asc' => '1' );    $urld = add_query_arg( 'sort' => 'price', 'asc' => '0' );?><a href="<?php echo esc_url( $url ); ?>">Sort by price (asc)</a><a href="<?php echo esc_url( $url ); ?>">Sort by price (desc)</a>

When clicked, the tacked on variables can thus be detected:

<?php    // Get an allowed sort variable and the order    $sort = isset( $_GET['sort'] ) && in_array( $_GET['sort'], array( 'price' ) ) )            ? $_GET['sort'] : null;    $order = isset( $_GET['asc'] ) && $_GET['asc'] == '0' ? 'DESC' : 'ASC';?>

Now you would augment your main query with the data you just retrieved. If you're using the default way of querying posts on a page you should be able to get away with query_posts, although it is not recomended. And, if you're using a custom loop, simply inject the new arguments into it:

<?php    $args = array();    switch ( $sort ):        case 'price':            $args['order'] = $order;            $args['orderby'] = 'meta_value_num';            $args['meta_key'] = 'price';            break;        default:            break;    endswitch;    $defaults = array( 'posts_per_page' => 33 );    $query = new WP_Query( wp_parse_args( $args, $defaults ) );?>

You can add more variables, by creating more URLs and buttons to press, and more cases in the switch statement to extend the basic example above.

The first piece of code would go wherever you want your buttons to appear. The second piece of code goes before the third one, which goes before outputting the results.

OK, I update the code to make it clear:

---I do not think meta_key would be auto-pickup---

functions.php

...    $whitList = array(       'price' => array(         'posts_per_page' => 33,         'meta_key'=>'price',         'orderby'=>'meta_value_num',         'order' => ASC       ),       'date' => array(         'posts_per_page' => 33,         'orderby'=>'date',         'order' => DESC       )    );...

Your first loop php:

<?php gloabl $whitList; //to use the $whitList in your functions.php.$aryQuery = $whitList[$_REQUEST['orderby']] ? $whitList[$_REQUEST['orderby']] : $whitList['price'];$featuredPosts = new WP_Query( $aryQuery ); ........?>

For your list page:

<ul><?php   gloabl $whitList; //to use the $whitList in your functions.php.   foreach( $whitList as $orderby => $aryOrderBySettings){      ?>      <li> <a href="<?php echo esc_url(add_query_arg('orderby', $orderby));?>">Order by <?php echo $orderby;?></a></li>      <?php   } ?></ul>